CN102718363B - Coking wastewater comprehensive treatment method and system thereof - Google Patents
Coking wastewater comprehensive treatment method and system thereof Download PDFInfo
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- CN102718363B CN102718363B CN201210211540.5A CN201210211540A CN102718363B CN 102718363 B CN102718363 B CN 102718363B CN 201210211540 A CN201210211540 A CN 201210211540A CN 102718363 B CN102718363 B CN 102718363B
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Abstract
The invention discloses a coking wastewater comprehensive treatment method comprising the following steps of: pre-treatment, biochemical treatment and deep treatment. The deep treatment step comprises sequential steps of filtering, ultra-filtering, carrying out resin adsorption, re-filtering, and carrying out reverse osmosis. With the adoption of a coking wastewater comprehensive treatment system of the coking wastewater comprehensive treatment method, the pre-treatment step adopts a de-oiling pond, an adjusting pond and an air floating pond, which are connected in sequence; the biochemical treatment step adopts a primary aeration pond, a primary settling pond, an oxygen-poor pond, an aerobic pond and a secondary settling pond, which are connected in sequence; and the deep treatment step adopts a multi-medium filter, an ultra-filtering device, a resin adsorption column and a reverse osmosis device. The coking wastewater comprehensive treatment method has the beneficial effects that the method is stable to operate and has a simple process and good treating effects.
Description
Technical field
The present invention relates to field of waste water treatment, relate in particular to coking chemical waste water integrated conduct method and system thereof.
Background technology
Coking chemical waste water is to produce water in the high temperature carbonization of coal, gas purification and Chemicals rectifying, its composition and character and raw coal ature of coal, carbonization temperature, production technique and Chemicals recovery method are closely related, be a kind of waste water that contains a large amount of hazardous and noxious substances, quite large to the harm of environment.Solve coking chemical waste water pollution problem and have two Basic Ways: the one, reform technique, strengthens operational management, reduces water of productive use, directly reduces quantity discharged, reduces the waste water water yield, repeats, recycles water, fundamentally the discharge of elimination and pollution abatement thing; The 2nd, the coking chemical waste water that produces water is carried out to relevant treatment, make it reach corresponding emission request.
Conventional processes is low to ammonia nitrogen, COD clearance, and after pre-treatment and biochemical treatment, water quality still can not reach national grade one discharge standard.In the advanced treatment of coking chemical waste water, adopted second level reverse osmosis apparatus in recent years, ammonia nitrogen and COD removal are greatly improved, but due to ammonia-nitrogen content in coking chemical waste water and COD higher, reverse osmosis unit easily stops up in operational process, back flushing is frequent, the damage of film is larger, and also greatly reduce work-ing life, has increased cost to investment and operation.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of coking chemical waste water integrated conduct method and system thereof, by in conjunction with pre-treatment, biochemical treatment, ultrafiltration and resin absorption technique, make effluent quality meet national grade one discharge standard, again in conjunction with first-stage reverse osmosis technique, effluent quality is met and loop back water requirement, realized coking chemical waste water zero disposal of pollutants and recycle.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: coking chemical waste water integrated conduct method, comprise the following steps: pre-treatment, biochemical treatment, advanced treatment, in described advanced treatment step, filter successively, ultrafiltration, resin absorption, refilter and reverse osmosis.
As preferably, in described pre-treatment step, coking chemical waste water enters grease removal tank tar removing, and grease removal tank water outlet flows into equalizing tank, and the dephenolize of equalizing tank oxidizer, adds NaOH or Ca (OH)
2regulate PH to 6～9, waste water flows into air flotation pool again, by air flotation pool, removes the material that density is less than water, then adds flocculation agent and make suspended substance flocculation sediment, the materials such as removal heavy metal and prussiate.
As preferably, the pond aeration that first exposes to the sun through just in described biochemical treatment step, controls dissolved oxygen at 2～9mg/l, then carries out mud-water separation through preliminary sedimentation tank, and isolated water flows into anoxic pond and carries out anti-nitration reaction, and controls dissolved oxygen < 0.5mg/l; Anoxic pond water outlet flows into Aerobic Pond and carries out nitration reaction, by aerator, increases oxygen in water to 2～4mg/l; Aerobic Pond water outlet flows into second pond and carries out mud-water separation.
As preferably, preliminary sedimentation tank described in described biochemical treatment step carries out after mud-water separation isolated active sludge major part sends the pond of just exposing to the sun back to and recycles, and excess sludge send sludge thickener further concentration; Described second pond carries out after mud-water separation isolated active sludge major part sends the pond of just exposing to the sun back to and recycles, and excess sludge send sludge thickener further concentration.
As preferably, in described advanced treatment step, by producing water after biochemical treatment, through more medium filter, filter; Produce water and enter ultra-filtration equipment; Ultrafiltration is produced water and send into resin absorbing column behind ultrafiltration pond; Product water through resin absorbing column filters through cartridge filter; Produce water to reverse osmosis unit, water outlet flows into product water tank, is finally delivered to circulation reusing device.
Adopt the coking chemical waste water total system of above-mentioned coking chemical waste water integrated conduct method, described pre-treatment step adopts connected successively grease removal tank, equalizing tank, air flotation pool, described biochemical treatment step adopts the first pond of exposing to the sun, preliminary sedimentation tank, anoxic pond, Aerobic Pond, the second pond that are connected successively, and described advanced treatment step adopts connected successively more medium filter, ultra-filtration equipment, resin absorbing column, reverse osmosis unit.
As preferably, in described more medium filter, load activated carbon granule or ceramic grain filter.
As preferably, in described resin absorbing column, adopt macropore strong acid cation exchange resin, the resin of inefficacy can continue to use after adopting the dilute sulphuric acid regenerated liquid of 0.5mol/l to regenerate.
The present invention has following beneficial effect:
1, present method is stable, and technique is simple, and treatment effect is good.
2, the second level reverse osmosis apparatus in the past adopting, easily causes reverse osmosis membrane to stop up, and changes frequently, and running cost is high.Present method adopts resin adsorption method in conjunction with first-stage reverse osmosis technique in follow-up advanced treatment, effluent quality can reach cycling use of water requirement, resin absorbing column can adsorb ammonia nitrogen in waste water, reduce COD, ammonia nitrogen and COD in reverse osmosis unit water inlet are reduced greatly, reverse osmosis membrane is difficult for stopping up, and macroporous resin can recover adsorptive power by regeneration, therefore greatly reduces running cost.
3, present method reaches more than 96% the clearance of ammonia nitrogen and COD, has thoroughly solved in conventional processes ammonia nitrogen and the low problem of COD clearance.
4, process rear water quality and reach national grade one discharge standard, meet and loop back water requirement simultaneously, waste water is fully recycled, and has both protected environment, has saved again water resources.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of coking chemical waste water integrated conduct method of the present invention
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
Figure 1 shows that coking chemical waste water integrated conduct method of the present invention, concrete operations are as follows:
Described coking chemical waste water enters grease removal tank 1 tar removing, and tar enters oil basin 20 and stores.Grease removal tank 1 water outlet is from flowing into equalizing tank 2, and equalizing tank 2 oxidizer dephenolizes, add NaOH or Ca (OH)
2regulate PH to 6～9, waste water flows into air flotation pool 3 again, by air flotation pool 3, removes the material that density is less than water, then adds flocculation agent and make suspended substance flocculation sediment, the materials such as removal heavy metal and prussiate, and the scum silica frost producing through coagulation air-float is from entering storage slag bath 21.After pretreatment, water quality reaches the requirement of follow-up biochemical treatment substantially, water-quality guideline difference: ammonia nitrogen <500mg/l, COD<2000mg/l, prussiate <5mg/l, volatile phenol <300mg/l.
Pre-treatment is produced water and is entered biochemical treatment step, and pond 4 aerations that first expose to the sun through are just controlled dissolved oxygen at 2～9mg/l, for rear end nitrification and denitrification provides condition; Through preliminary sedimentation tank 5, carry out mud-water separation again, isolated active sludge major part is sent the pond 4 of just exposing to the sun back to and is recycled, and excess sludge send sludge thickener 22 further concentration; Isolated water flows into anoxic pond 6 and carries out anti-nitration reaction, and controls dissolved oxygen < 0.5mg/l; Anoxic pond 6 water outlets flow into Aerobic Pond 7 and carry out nitration reaction, by aerator, increase oxygen in water to 2～4mg/l; Aerobic Pond 7 water outlets flow into second pond 8 and carry out mud-water separation, and isolated active sludge major part is sent the pond 4 of just exposing to the sun back to and recycled, and excess sludge send sludge thickener 22 further concentration.Biochemical processing process energy oxygenolysis ammonia nitrogen, volatile phenol, prussiate etc., degradation of organic substances.After biochemical treatment, effluent quality is: COD<200mg/l, and ammonia nitrogen <25mg/l, phenols clearance reaches more than 99%.
After biochemical treatment, produce water and be promoted to more medium filter 10 through raw water pump 9, further remove suspended substance, colourity and ammonia nitrogen, reduce COD, in more medium filter 10, load activated carbon granule or ceramic grain filter; Produce water and enter ultra-filtration equipment 11, hold back larger molecular organics, colloid, protein etc.; Ultrafiltration is produced water and by impeller pump 13, send into resin absorbing column 14 behind ultrafiltration pond 12, be mainly used in efficiently removing organism, ammonia nitrogen, COD and colourity have been reduced to a greater degree, make the water quality of ustulate coking chemical waste water become light, improve the influent quality that enters reverse osmosis unit, reduce the operation burden of reverse osmosis membrane, thereby reduce the running cost of reverse osmosis unit.In resin absorbing column 14, adopt macropore strong acid cation exchange resin, be connected to H+ ion on resin sulfonic group can with waste water in NH
4 +exchange, is effectively removed the ammonia nitrogen in waste water mutually, and the resin of inefficacy can continue to use after adopting the dilute sulphuric acid regenerated liquid of 0.5mol/l to regenerate.
Through resin absorbing column 14, produce water through cartridge filter 15, further hold back suspended substance, protect follow-up reverse osmosis unit; Produce water and be promoted to reverse osmosis unit 17 through high-pressure pump 16, hold back small organic molecule, colloid, bacterium, all ions, remove ammonia nitrogen, reduce COD, and water outlet flows into product water tank 18, by impeller pump 19, is delivered to circulation reusing device.After advanced treatment, water quality is: COD<60mg/l, and ammonia nitrogen <10mg/l, Fe<0.3mg/l, turbidity <3NTU, PH is 6～9.Water quality reuse capable of circulation after processing.
Claims (1)
1. coking chemical waste water integrated conduct method, it is characterized in that: comprise the following steps: pre-treatment, biochemical treatment, advanced treatment, in described advanced treatment step, filter successively, ultrafiltration, resin absorption, refilter and reverse osmosis, in described pre-treatment step, coking chemical waste water enters grease removal tank tar removing, grease removal tank water outlet flows into equalizing tank, the dephenolize of equalizing tank oxidizer, adds NaOH or Ca (OH)
2regulate PH to 6～9, waste water flows into air flotation pool again, by air flotation pool, remove the material that density is less than water, add again flocculation agent and make suspended substance flocculation sediment, removal heavy metal and prussiate, pond aeration first exposes to the sun through just in described biochemical treatment step, control dissolved oxygen at 2～9mg/l, through preliminary sedimentation tank, carry out mud-water separation again, isolated water flows into anoxic pond and carries out anti-nitration reaction, and controls dissolved oxygen < 0.5mg/l, anoxic pond water outlet flows into Aerobic Pond and carries out nitration reaction, by aerator, increases oxygen in water to 2～4mg/l, Aerobic Pond water outlet flows into second pond and carries out mud-water separation, and preliminary sedimentation tank described in described biochemical treatment step carries out after mud-water separation isolated active sludge major part sends the pond of just exposing to the sun back to and recycle, and excess sludge send sludge thickener further concentration, described second pond carries out after mud-water separation isolated active sludge major part sends the pond of just exposing to the sun back to and recycles, and excess sludge send sludge thickener further concentration, in described advanced treatment step, by producing water after biochemical treatment, through more medium filter, filters, produce water and enter ultra-filtration equipment, ultrafiltration is produced water and send into resin absorbing column behind ultrafiltration pond, product water through resin absorbing column filters through cartridge filter, produce water to reverse osmosis unit, water outlet flows into product water tank, finally be delivered to circulation reusing device, described pre-treatment step adopts connected successively grease removal tank, equalizing tank, air flotation pool, described biochemical treatment step adopts the first pond of exposing to the sun being connected successively, preliminary sedimentation tank, anoxic pond, Aerobic Pond, second pond, described advanced treatment step adopts connected successively more medium filter, ultra-filtration equipment, resin absorbing column, reverse osmosis unit, in described more medium filter, load activated carbon granule or ceramic grain filter, in described resin absorbing column, adopt macropore strong acid cation exchange resin, the resin losing efficacy can continue to use after adopting the dilute sulphuric acid regenerated liquid of 0.5mol/l to regenerate.
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| CN103102049B (en) * | 2013-03-07 | 2014-05-07 | 苏州苏净环保工程有限公司 | High-nitrogen-concentration organic wastewater treatment method |
| CN103466890A (en) * | 2013-09-17 | 2013-12-25 | 山东潍焦集团有限公司 | Coking wastewater deep treatment and recycling device and application method thereof |
| CN104926035B (en) * | 2015-06-11 | 2017-06-27 | 武汉钢铁(集团)公司 | Coking comprehensive wastewater advanced treatment recycling technique and device |
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| CN106477825A (en) * | 2016-12-02 | 2017-03-08 | 东北大学 | Coking waste water treatment method |
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| CN110304752A (en) * | 2018-03-20 | 2019-10-08 | 宝武炭材料科技有限公司 | A kind of processing method being concentrated again for coking wastewater reverse osmosis concentrated water |
| CN110407395A (en) * | 2018-04-27 | 2019-11-05 | 宝武炭材料科技有限公司 | Method and system for removing total organic carbon and ammonia nitrogen in coking wastewater |
| CN108892333A (en) * | 2018-08-30 | 2018-11-27 | 环能科技股份有限公司 | A kind of concentration organic wastewater disposal process and system |
| CN109879535A (en) * | 2019-03-10 | 2019-06-14 | 南昌市国昌环保科技有限公司 | A kind of method of coking wastewater drop cyanogen |
| CN110117114A (en) * | 2019-05-30 | 2019-08-13 | 郑州大学综合设计研究院有限公司 | A kind of coal tar effective component extraction production wastewater treatment new process |
| CN110683718A (en) * | 2019-11-08 | 2020-01-14 | 中冶南方都市环保工程技术股份有限公司 | Coking phenol cyanogen waste water intensive treatment system |
| CN111517561A (en) * | 2020-03-31 | 2020-08-11 | 临涣焦化股份有限公司 | Coking chemical product refining wastewater treatment method |
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| CN113428931B (en) * | 2021-08-26 | 2021-11-19 | 山东彩客东奥化学有限公司 | Device and method for continuously treating nitrotoluene wastewater |
| CN113912221A (en) * | 2021-11-23 | 2022-01-11 | 詹长贵 | Coking wastewater treatment process |
| CN114477626B (en) * | 2021-12-31 | 2023-10-27 | 新兴铸管股份有限公司 | Coking wastewater treatment system |
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